Research has suggested that London Underground Tube trains are running too fast.

A mathematical paper on transport in London and New York reflected that if the train journey's are too speedy in comparison to going by road, there will be an increase in overall congestion.

The study has urged the capital to be cautious about the speed at which underground trains travel.

London Underground could be traveling too fast

Researchers reported their findings in the journal Royal Society Interface and found that London's system would operate more efficiently with trains traveling an estimated 1.2 times faster than the average road speed.

This equates to the prime train speed running at 13mph, the current average in the capital is 21mph.